Observations Of Brown Dwarf Companions With A Small Well-corrected Telescope Subaperture

Details Observations Of Brown Dwarf Companions With A Small Well-corrected Telescope Subaperture Observations Of Brown Dwarf Companions With A Small Well-corrected Telescope Subaperture

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21431405s&link_type=abstract

American Astronomical Society, AAS Meeting #214, #314.05; Bulletin of the American Astronomical Society, Vol. 41, p.759

Physics

Optics

Scientific paper

We have used our 1.6 m diameter off-axis well-corrected sub-aperture (WCS) on the Palomar Hale telescope together with a small inner-working-angle (IWA) phase-mask coronagraph to image the immediate environs of a small number of nearby stars, including HD 130948, HD 49197 and HR7672, which have known brown dwarf companions at small separations, all of which were detected. We also present the initial detection of a new object close to the nearby young G0V star HD171488. Follow up observations are needed to determine if this object is a bona fide companion, but its flux is consistent with the flux of a young brown dwarf or low mass M star at the same distance as the primary. Our WCS coronagraph demonstrates a limiting detectable contrast comparable to that of extant Lyot coronagraphs on much larger telescopes corrected with current-generation AO systems, suggesting that small apertures corrected to extreme adaptive optics (ExAO) levels can be used to carry out initial surveys for close brown dwarf and stellar companions, leaving followup observations for larger telescopes.

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